Dlls are Simple. Part 1

// Hello Evryone!
//MyFirstDll.cpp : By Mahmood Komeily For Codeproject &Beginer!
//

#include "stdafx.h"
#include "MyFirstDll.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define DLLEXPORT __declspec(dllexport)

/////////////////////////////////////////////////////////////////////////////
// CMyFirstDllApp

BEGIN_MESSAGE_MAP(CMyFirstDllApp, CWinApp)
	//{{AFX_MSG_MAP(CMyFirstDllApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyFirstDllApp construction

CMyFirstDllApp::CMyFirstDllApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CMyFirstDllApp object

CMyFirstDllApp theApp;
/////////////////////////////////
//        THIS FUNCTION WILL EXPORT
//     BY DECLARING AS "DLLEXPORT"
/////////////////////////////////
DLLEXPORT int Multiply(int ParOne,int ParTwo)
{
	int Mlt=ParOne*ParTwo;
	return Mlt;
}